<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <!-- import CSS -->
  <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
  <style>
    .el-header {
      background-color: #B3C0D1;
      color: #333;
      line-height: 60px;
    }

    .el-aside {
      color: #333;
    }

    html,
    body,
    #app,
    .el-container {
      padding: 0px;
      margin: 0px;
      height: 100%;
    }

    .my-layout-admin {
      position: fixed;
      top: 120px;
      left: 242px;
      right: 0px;
      bottom: 0px;
    }

    .mydmin-iframe {
      position: absolute;
      width: 100%;
      height: 100%;
      left: 0;
      top: 0;
      right: 0;
      bottom: 0;
    }
  </style>
</head>

<body>
  <div id="app" style="padding:100px;">
     我是CCC
  </div>
</body>